German museums might want to start beefing up their security. In late April, a group of thieves stole the world’s largest gold coin from the Bode Museum in Berlin—somehow going undetected as they made off with the 221-pound chunk of change. Now, another German institution has been hit by thievery. As the Associated Press reports, a diamond-encrusted tiara was recently pilfered from the Badisches Landesmuesum in the city of Karlsruhe.

The gold and platinum tiara is adorned with 367 diamonds and has been valued at about $1.31 million. It was locked up in a cabinet in the museum’s throne room prior to the theft, which was discovered on April 29.

The tiara once belonged to Grand Duchess Hilda von Baden, according to The Columbus Dispatch. She was married to Grand Duke Friedrich II, who ascended to the throne in 1907 and ruled over the territory of Baden. A statement from the Badisches Landesmuesum says that the headpiece may have been crafted for the occasion of Friedrich II’s coronation. The couple’s reign, however, was short-lived: Friedrich II was forced to abdicate in 1918, after Germany’s defeat in WWI.

Baden-Wuerttemberg criminal police said they are now looking for witnesses who may have seen something fishy around the time of the theft.

Brigit Katz is a journalist based in New York City. Her work has appeared in New York magazine, Flavorwire, and Women in the World, a property of The New York Times.

Queen Victoria's coronet (Courtesy of the U.K. Department for Culture, Media and Sport.)

Queen Victoria's husband, Prince Albert, had a small crown (called a coronet) made for her as a wedding present. The silver coronet was studded with hundreds of small diamonds and topped off with 11 large, blue sapphires. The coronet’s current owner has now put the artifact up for auction. This has sparked a fear that a foreign buyer might try take it out of the U.K. British officials are now doing everything they can to try and ensure that one of her crowns does not leave British soil. “Queen Victoria’s coronet is stunning. It is one of the most iconic jewels from a pivotal period in our history and symbolizes one of our nation’s most famous love stories,” British Minister of State for digital and culture, Matt Hancock says in a statement. “I hope that we are able to keep the coronet in the U.K. and on display for the public to enjoy for years to come.”

The coronet is seen as both a symbol of her reign as well as of her relationship with Prince Albert. She wore it in official portraits, as well as in 1866, when she attended the State Opening of Parliament for the first time since her husband’s death five years before instead of the traditional coronation crown, the BBC reports.

Officials began to worry about what might happen to the iconic coronet when the current owner put it up for auction and applied for an export license. In an attempt to give some patriotic British buyer time to put in a competitive bid, Hancock has placed a temporary export ban on the coronet through December 27, 2016, though it has the option of being extended through June 2017 if a buyer demonstrates that they can raise money to cover the $6.5 million asking price, as well as $1.3 million in taxes on the sale. “Its departure would be a great loss, given its beauty, its associations and its history,” Philippa Glanville, a member of the Reviewing Committee on the Export of Works of Art and Objects of Cultural Interest, says in a statement. It is unclear what will happen if the deadline passes without someone stepping up and promising to keep the crown in the country.